So you need
1 box - I use a nuc box sometimes with and sometimes without frames.
1 ventilated crown board for box - which you can fasten down.
1 Ladder - because they're never where they're described to be.
1 pair sharp secutares and potentially 1 saw
1 can Faust/Neutradol or similar.
1 smallish bucket (I have a 5litre ex growmore bucket) and/or small margarine tub
1 smoker
1 small sheet - enough to cover the nuc box
In ideal circumstances you put the nuc box under the bees, knock them off the branch they're hanging on, move the box 3 feet to the side, put the crown board on leaving a 1/2" gap, spray the branch with Faust, wait 45 minutes. Screw lid down and walk away with bees.. right
More likely you can just reach the branch if you're standing on top of the ladder, but you can't actually cut it.. you are allowed to prune a few twigs, enough to get the bucket under the swarm although they're spread out along the branch so only about 1/3 are going to land in the bucket - the rest will land on you/take to the air. So you knock them off, take the 1/3 in the bucket and put them in the Nuc box, but didn't get the queen.. Wait 5 minutes for them to recluster on the branch, knock them into the bucket again, getting the queen this time, put them in the nuc, go back up the ladder shake the bees off and spray with faust putting a good cloud in the air. Wait 1.5 hours for 99% of the bees to go in the box. put the lid on then have to cover with a sheet to keep the 50 or so on the outside under wraps whilst you transport them.
Then again they could be 25 ft up an old apple tree, where a ladder wont reach, but you can if you're carefull get them into the bucket if you're above them.. then have to climb down ....
Or they're 10ft up on top of a smooth 8" round post where you can't put a box/bucket above them..
Or they could be exhausted and cold in the middle of a lawn.. this is where the frames come in, as (assuming they're not too cold to move) they will walk into a box on its side with frames in, and can be encouraged to do so with a little smoke..
So nothing to it really